Voltage controlled oscillator, and PLL circuit and radio...

Details Voltage controlled oscillator, and PLL circuit and radio... Voltage controlled oscillator, and PLL circuit and radio...

2011-05-17

2011-05-17

Johnson, Ryan (Department: 2817)

Oscillators

Solid state active element oscillator

Transistors

C331S17700V

Reexamination Certificate

active

07944318

ABSTRACT:
A voltage controlled oscillator includes an inductor circuit, C-coupling type variable capacitance circuits, a direct-coupling type variable capacitance circuit, and a negative resistance circuit, which are connected in parallel, and a reference voltage generating section that generates two reference voltages. A control voltage for feedback control of an oscillation frequency is applied to back gate terminals of variable capacitance elements of the variable capacitance circuits. The reference voltages are applied to gate terminals of the variable capacitance elements of the C-coupling type variable capacitance circuits, respectively.

REFERENCES:
patent: 6509805 (2003-01-01), Ochiai
patent: 6995626 (2006-02-01), Oehm et al.
patent: 7321271 (2008-01-01), Takinami et al.
patent: 2004-147310 (2004-05-01), None

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